Adjustable seating device



FIG. 1 is a front perspective view showing the adjustable seating device with rotating shaft in the backrest position;

FIG. 2 is a front plan view thereof;

FIG. 3 is a rear plan view thereof;

FIG. 4 is a left plan view thereof;

FIG. 5 is a right plan view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a rear perspective view showing the adjustable seating device with rotating shaft in the desktop position;

FIG. 9 is a front plan view thereof;

FIG. 10 is a rear plan view thereof;

FIG. 11 is left plan view thereof;

FIG. 12 is a right plan view thereof;

FIG. 13 is a top plan view thereof; and,

FIG. 14 is a bottom plan view thereof. 

CLAIM The ornamental design for an adjustable seating device, as shown and described. 